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SUB-FRAME CONNECTOR ON A 911
Has anyone welded sub-frame connectors onto their 911?
I was talking to some racer dudes and they've all done it. Perhaps their cars need it and not our 911. So I was at my mechanics shop and he had an NSX on the lift and I took a picture of how they did it. Basically, they welded two bars along the sides then and "X" to connect them. They used 1 inch by 2 inch bars so you only lose an inch of ground clearance. The picture below should help. 
Last edited by v9ff; 11-16-2004 at 08:27 AM.. |
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11-16-2004, 08:19 AM
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Senior Member
Join Date: Jun 2000
Location: N. Phoenix AZ USA
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Steve,
My first thought would be that if it was really needed, that the Porsche factory would have done it on their race cars. Joe a
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2013 Jag XF, 2002 Dodge Ram 2500 Cummins (the workhorse), 1992 Jaguar XJ S-3 V-12 VDP (one of only 100 examples made), 1969 Jaguar XJ (been in the family since new), 1985 911 Targa backdated to 1973 RS specs with a 3.6 shoehorned in the back, 1959 Austin Healey Sprite (former SCCA H-Prod), 1995 BMW R1100RSL, 1971 & '72 BMW R75/5 "Toaster," Ural Tourist w/sidecar, 1949 Aeronca Sedan / QB |
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11-16-2004, 08:50 AM
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Location: Ann Arbor, MI
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Coupes shouldn't need it if they have a 6-or-more point cage. I could see it benefiting a car that doesn't have a cage ... but not as good a job as a cage could do.
Targa's and Cab's would benefit the most.
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Project935 Tube Chassis Turbo RSR/934/935 racer - SOLD in 6/'06 Gruppe B #101 What's next? |
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11-16-2004, 08:53 AM
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Quote:
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11-16-2004, 08:54 AM
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Back in the saddle again
Join Date: Oct 2001
Location: Central TX west of Houston
Posts: 56,053
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I think usually when they add a full cage they add bracing sorta like that but inside the car not outside. It seems the full cage like we might buy ready made is not as extensive as what ends up in a real racecar.
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Steve '08 Boxster RS60 Spyder #0099/1960 - never named a car before, but this is Charlotte. '88 targa  SOLD 2004 - gone but not forgotten
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11-16-2004, 09:48 AM
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I haven't heard of Porsche adding additional bracing to a chassis - other than adding more tubes here and there to the cage. Most early cages were Al to save weight ... that would never fly with today's racing regs.
A fair amount of chassis stiffness can be had by stitch welding the bodypanel edges ... ie. not relying on the spotwelds alone. But that is more for full-prep race cars. Would also make panel replacement fun ... I like the X underbody connectors as long as the car isn't too low already. You could probably talk Thom into trying it 
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Project935 Tube Chassis Turbo RSR/934/935 racer - SOLD in 6/'06 Gruppe B #101 What's next? |
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11-16-2004, 11:07 AM
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Senior Member
Join Date: Jun 2000
Location: N. Phoenix AZ USA
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935,
Was at Patrick Motorsports a while ago and they welded each and every seam, not just the spot welding. Asked about it and they said that it really stiffened up the car and did not add that much weight. Joe A
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2013 Jag XF, 2002 Dodge Ram 2500 Cummins (the workhorse), 1992 Jaguar XJ S-3 V-12 VDP (one of only 100 examples made), 1969 Jaguar XJ (been in the family since new), 1985 911 Targa backdated to 1973 RS specs with a 3.6 shoehorned in the back, 1959 Austin Healey Sprite (former SCCA H-Prod), 1995 BMW R1100RSL, 1971 & '72 BMW R75/5 "Toaster," Ural Tourist w/sidecar, 1949 Aeronca Sedan / QB |
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11-19-2004, 02:54 PM
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1984 Porsche 911 3.2
